code: def _parse_instance(self, instance, lexelt):
      senses = []
      context = []
      position = None
      for child in instance:
          if child.tag == "answer":
              senses.append(child.attrib["senseid"])
          elif child.tag == "context":
              context += self._word_tokenizer.tokenize(child.text)
              for cword in child:
                  if cword.tag == "compound":
                      cword = cword[0]  # is this ok to do?
  
                  if cword.tag == "head":
                      # Some santiy checks:
                      assert position is None, "head specified twice"
                      assert cword.text.strip() or len(cword) == 1
                      assert not (
                          cword.text.strip() and len(cword) == 1
                      )
                      # Record the position of the head:
                      position = len(context)
                      # Add on the head word itself:
                      if cword.text.strip():
                          context.append(cword.text.strip())
                      elif cword[0].tag == "wf":
                          context.append(
                              (cword[0].text, cword[0].attrib["pos"])
                          )
                          if cword[0].tail:
                              context += self._word_tokenizer.tokenize(
                                  cword[0].tail
                              )
                      else:
                          assert False, "expected CDATA or wf in <head>"
                  elif cword.tag == "wf":
                      context.append((cword.text, cword.attrib["pos"]))
                  elif cword.tag == "s":
                      pass  # Sentence boundary marker.
  
                  else:
                      print("ACK", cword.tag)
                      assert False, "expected CDATA or <wf> or <head>"
                  if cword.tail:
                      context += self._word_tokenizer.tokenize(
                          cword.tail
                      )
          else:
              assert False, "unexpected tag %s" % child.tag
      return SensevalInstance(lexelt, position, context, senses)
  
file_path: nltk/nltk/corpus/reader/senseval.py
imports: import re
  from xml.etree import ElementTree
  from nltk.corpus.reader.api import *
  from nltk.corpus.reader.util import *
  from nltk.tokenize import *
label_desc: Use image node_id 3 for calling the SensevalCorpusView obj's underlying member method code with example usage: obj._parse_instance(instance, lexelt) and returns: SensevalInstance